X-Git-Url: https://git.octo.it/?p=collectd.git;a=blobdiff_plain;f=src%2Fplugin.c;h=30a1ff1a304911f91e571fe56cd22c4d15535078;hp=894b0e51d72731ba1f7faab5c032a122063e85be;hb=633c3966f770e4d46651a2fe219a18d8a9907a9f;hpb=a6e74e0d316ee14f45093246e0e5e2d84faa8690 diff --git a/src/plugin.c b/src/plugin.c index 894b0e51..30a1ff1a 100644 --- a/src/plugin.c +++ b/src/plugin.c @@ -1,19 +1,24 @@ /** * collectd - src/plugin.c - * Copyright (C) 2005-2013 Florian octo Forster + * Copyright (C) 2005-2014 Florian octo Forster * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; only version 2 of the License is applicable. + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. * * Authors: * Florian octo Forster @@ -31,6 +36,7 @@ #include "utils_llist.h" #include "utils_heap.h" #include "utils_time.h" +#include "utils_random.h" #if HAVE_PTHREAD_H # include @@ -108,6 +114,7 @@ static int read_threads_num = 0; static write_queue_t *write_queue_head; static write_queue_t *write_queue_tail; +static long write_queue_length = 0; static _Bool write_loop = 1; static pthread_mutex_t write_lock = PTHREAD_MUTEX_INITIALIZER; static pthread_cond_t write_cond = PTHREAD_COND_INITIALIZER; @@ -117,6 +124,9 @@ static size_t write_threads_num = 0; static pthread_key_t plugin_ctx_key; static _Bool plugin_ctx_key_initialized = 0; +static long write_limit_high = 0; +static long write_limit_low = 0; + /* * Static functions */ @@ -670,11 +680,13 @@ static int plugin_write_enqueue (value_list_t const *vl) /* {{{ */ { write_queue_head = q; write_queue_tail = q; + write_queue_length = 1; } else { write_queue_tail->next = q; write_queue_tail = q; + write_queue_length += 1; } pthread_cond_signal (&write_cond); @@ -701,8 +713,11 @@ static value_list_t *plugin_write_dequeue (void) /* {{{ */ q = write_queue_head; write_queue_head = q->next; - if (write_queue_head == NULL) + write_queue_length -= 1; + if (write_queue_head == NULL) { write_queue_tail = NULL; + assert(0 == write_queue_length); + } pthread_mutex_unlock (&write_lock); @@ -805,6 +820,7 @@ static void stop_write_threads (void) /* {{{ */ } write_queue_head = NULL; write_queue_tail = NULL; + write_queue_length = 0; pthread_mutex_unlock (&write_lock); if (i > 0) @@ -1206,6 +1222,27 @@ int plugin_register_shutdown (const char *name, (void *) callback, /* user_data = */ NULL)); } /* int plugin_register_shutdown */ +static void plugin_free_data_sets (void) +{ + void *key; + void *value; + + if (data_sets == NULL) + return; + + while (c_avl_pick (data_sets, &key, &value) == 0) + { + data_set_t *ds = value; + /* key is a pointer to ds->type */ + + sfree (ds->ds); + sfree (ds); + } + + c_avl_destroy (data_sets); + data_sets = NULL; +} /* void plugin_free_data_sets */ + int plugin_register_data_set (const data_set_t *ds) { data_set_t *ds_copy; @@ -1423,7 +1460,8 @@ int plugin_unregister_notification (const char *name) void plugin_init_all (void) { - const char *chain_name; + char const *chain_name; + long write_threads_num; llentry_t *le; int status; @@ -1436,16 +1474,38 @@ void plugin_init_all (void) chain_name = global_option_get ("PostCacheChain"); post_cache_chain = fc_chain_get_by_name (chain_name); + write_limit_high = global_option_get_long ("WriteQueueLimitHigh", + /* default = */ 0); + if (write_limit_high < 0) { - char const *tmp = global_option_get ("WriteThreads"); - int num = atoi (tmp); + ERROR ("WriteQueueLimitHigh must be positive or zero."); + write_limit_high = 0; + } - if (num < 1) - num = 5; + write_limit_low = global_option_get_long ("WriteQueueLimitLow", + /* default = */ write_limit_high / 2); + if (write_limit_low < 0) + { + ERROR ("WriteQueueLimitLow must be positive or zero."); + write_limit_low = write_limit_high / 2; + } + else if (write_limit_low > write_limit_high) + { + ERROR ("WriteQueueLimitLow must not be larger than " + "WriteQueueLimitHigh."); + write_limit_low = write_limit_high; + } - start_write_threads ((size_t) num); + write_threads_num = global_option_get_long ("WriteThreads", + /* default = */ 5); + if (write_threads_num < 1) + { + ERROR ("WriteThreads must be positive."); + write_threads_num = 5; } + start_write_threads ((size_t) write_threads_num); + if ((list_init == NULL) && (read_heap == NULL)) return; @@ -1730,6 +1790,7 @@ void plugin_shutdown_all (void) destroy_all_callbacks (&list_log); plugin_free_loaded (); + plugin_free_data_sets (); } /* void plugin_shutdown_all */ int plugin_dispatch_missing (const value_list_t *vl) /* {{{ */ @@ -1950,10 +2011,76 @@ static int plugin_dispatch_values_internal (value_list_t *vl) return (0); } /* int plugin_dispatch_values_internal */ +static double get_drop_probability (void) /* {{{ */ +{ + long pos; + long size; + long wql; + + pthread_mutex_lock (&write_lock); + wql = write_queue_length; + pthread_mutex_unlock (&write_lock); + + if (wql < write_limit_low) + return (0.0); + if (wql >= write_limit_high) + return (1.0); + + pos = 1 + wql - write_limit_low; + size = 1 + write_limit_high - write_limit_low; + + return (((double) pos) / ((double) size)); +} /* }}} double get_drop_probability */ + +static _Bool check_drop_value (void) /* {{{ */ +{ + static cdtime_t last_message_time = 0; + static pthread_mutex_t last_message_lock = PTHREAD_MUTEX_INITIALIZER; + + double p; + double q; + int status; + + if (write_limit_high == 0) + return (0); + + p = get_drop_probability (); + if (p == 0.0) + return (0); + + status = pthread_mutex_trylock (&last_message_lock); + if (status == 0) + { + cdtime_t now; + + now = cdtime (); + if ((now - last_message_time) > TIME_T_TO_CDTIME_T (1)) + { + last_message_time = now; + ERROR ("plugin_dispatch_values: Low water mark " + "reached. Dropping %.0f%% of metrics.", + 100.0 * p); + } + pthread_mutex_unlock (&last_message_lock); + } + + if (p == 1.0) + return (1); + + q = cdrand_d (); + if (q > p) + return (1); + else + return (0); +} /* }}} _Bool check_drop_value */ + int plugin_dispatch_values (value_list_t const *vl) { int status; + if (check_drop_value ()) + return (0); + status = plugin_write_enqueue (vl); if (status != 0) { @@ -1967,6 +2094,65 @@ int plugin_dispatch_values (value_list_t const *vl) return (0); } +__attribute__((sentinel)) +int plugin_dispatch_multivalue (value_list_t const *template, /* {{{ */ + _Bool store_percentage, ...) +{ + value_list_t *vl; + int failed = 0; + gauge_t sum = 0.0; + va_list ap; + + assert (template->values_len == 1); + + va_start (ap, store_percentage); + while (42) + { + char const *name; + gauge_t value; + + name = va_arg (ap, char const *); + if (name == NULL) + break; + + value = va_arg (ap, gauge_t); + if (!isnan (value)) + sum += value; + } + va_end (ap); + + vl = plugin_value_list_clone (template); + /* plugin_value_list_clone makes sure vl->time is set to non-zero. */ + if (store_percentage) + sstrncpy (vl->type, "percent", sizeof (vl->type)); + + va_start (ap, store_percentage); + while (42) + { + char const *name; + int status; + + /* Set the type instance. */ + name = va_arg (ap, char const *); + if (name == NULL) + break; + sstrncpy (vl->type_instance, name, sizeof (vl->type_instance)); + + /* Set the value. */ + vl->values[0].gauge = va_arg (ap, gauge_t); + if (store_percentage) + vl->values[0].gauge *= 100.0 / sum; + + status = plugin_write_enqueue (vl); + if (status != 0) + failed++; + } + va_end (ap); + + plugin_value_list_free (vl); + return (failed); +} /* }}} int plugin_dispatch_multivalue */ + int plugin_dispatch_notification (const notification_t *notif) { llentry_t *le;